I have a 2001 Subaru impreza WRX running with a decat downpipe but I keep getting the check engine warning light on ! I have been offered a cobra sports cat , if I was to fit this would it run without the light keep coming on? I want to check first cos the cat looks tiny compared to the cat on a standard downpipe, and it's a lot of money to fork out if I'm still gonna have the same problem. Any help will be greatly appreciated